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First XMM-Newton observations of strongly magnetic cataclysmic variables I: spectral studies of DP Leo and WW Hor | G. Ramsay
; M. Cropper
; F. Cordova
; K. Mason
; R. Much
; D. Pandel
; R. Shirey
; | Date: |
3 Jul 2001 | Journal: | Mon.Not.Roy.Astron.Soc. 326 (2001) L27 | Subject: | astro-ph | Affiliation: | MSSL/UCL, UCSB, ESTEC | Abstract: | We present an analysis of the X-ray spectra of two strongly magnetic cataclysmic variables, DP Leo and WW Hor, made using XMM-Newton. Both systems were in intermediate levels of accretion. Hard optically thin X-ray emission from the shocked accreting gas was detected from both systems, while a soft blackbody X-ray component from the heated surface was detected only in DP Leo. We suggest that the lack of a soft X-ray component in WW Hor is due to the fact that the accretion area is larger than in previous observations with a resulting lower temperature for the re-processed hard X-rays. Using a multi-temperature model of the post-shock flow, we estimate that the white dwarf in both systems has a mass greater than 1 Msun. The implications of this result are discussed. We demonstrate that the `soft X-ray excess’ observed in many magnetic cataclysmic variables can be partially attributed to using an inappropriate model for the hard X-ray emission. | Source: | arXiv, astro-ph/0107050 | Services: | Forum | Review | PDF | Favorites |
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